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70 AMX rear axle ring/pinion brand question |
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bvpotash1
AMC Nut Joined: Apr/02/2010 Location: Syracuse NY Status: Offline Points: 306 |
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Posted: Jul/04/2019 at 9:21pm |
Many years ago I bought a motive gear 3.73 ring and pinion for my 70. I'm just getting around to installing it. Has any one had a experience with this brand? It is made in Italy. Also I misplaced the pinion shim that goes behind the large bearing race. Any ideas what shim I should star with when setting up this new gear set? I also need new posi clutch plates. I bought the ones with the round corners, later model? I have the carrier that bolts together with square corner plates. As always thanks for your help, it is greatly appreciated.
-Bernie
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NCSteve
Supporter of TheAMCForum Joined: Nov/25/2017 Location: North Carolina Status: Offline Points: 70 |
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I just installed 4.88 motive gears in my JKU Rubicon. Lots of folks in my area use them with no issues. I always start with what was originally the housing and normally is really close starting point.
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1970 Big Bad orange AMX, 390 4speed, Go Pac
1979 Jeep Cherokee, 360, 4 speed/D20 2015 JKU Rubicon Tank Green |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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You may have issues with Motive or any brand for an AMC 20, they are not machined to use thefactory tools and I have little luck with them, actually sources a used set and returned all new ones. Pit Crew AND i have had same experience.....good luck.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4097 |
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Since you don't have the original pinion shim, setup will be a little more difficult. I'd start with a pinion shim of around .085-.095". Pretty thick, the factory shim was cast iron. The Yukon 3.73s in my AMX ended up taking about .102" to get a good pattern. I recommend getting a shim kit from Ratech. They have enough shims in their kit to build a pack that thick. Most master kits use GM size shims which don't quite fit the AMC needs. Bob tufcj
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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1970390amx
AMC Addicted Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3314 |
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several sets of gears I set up ended up with a pinion shim in the area of .100 Do you want to sell the wrong set of posi clutches you have?
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5808 |
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Get the solid pinion spacer from Ratech as well, should make it easier to swap in and out without having to worry about the crush tube.
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I've finally given up drinking for good...........now I only drink for evil.
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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Of course calling all of the "manufactures" tech support produced the same answer. "Never hear of that before.". This was in spite of the fact I had talked to other AMC people that said they had already called in the issue themselves. Edited by pit crew - Jul/12/2019 at 7:30am |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3808 |
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I haven't done any in a while, but .08-.10" sounds like what I've seen with OE gears. I use the TSM method and measure off the back of the pinion gear like Ross.
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bvpotash1
AMC Nut Joined: Apr/02/2010 Location: Syracuse NY Status: Offline Points: 306 |
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I'd like to thank every one for the fantastic information and incite! This Form and its members are truly the best!
THANK YOU!
-Bernie |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5926 |
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Did someone already mention using some "old" pinion bearings and honing the id so they are slip fit and use those to get a set up shim size, then do final assy with new pressed on bearings only 1 time, hopefully?
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